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I don't know the Indian restaurants there, but the Canvas Café in Hanbury Street did very decent food the one time I've been:
https://www.thecanvascafe.org/vegan-cafe
There's also a new Picky Wops:
http://fatgayvegan.com/2019/12/05/vegan-pizza-restaurant-to-open-on-brick-lane/
I haven't been yet, as it was only due to open on the 13th December.
Neither may be what you're after if he likes Indian food, but just in case.
I'm meeting a friend near Brick Lane, he's a non vegan visiting from Slovakia, I'm a vegan visiting from Leeds. Where's good to get grub? Think he fancies Indian food! Also, suggestions for pubs round there are also appreciated.